Browse Prior Art Database

Enhanced Air-Cooled Heatsink

IP.com Disclosure Number: IPCOM000038142D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Nuccio, C: AUTHOR

Abstract

Disclosed is a design concept of an air-cooled heatsink with an improved thermal efficiency when compared with conventional designs.

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Enhanced Air-Cooled Heatsink

Disclosed is a design concept of an air-cooled heatsink with an improved thermal efficiency when compared with conventional designs.

Conventional designs are extruded; however, when fin thickness and height exceed the limitations of the process, designers resort to stacking fins 3 parallel to each other with spacers 4 placed between each fin. They are then fixtured and brazed. The cooling medium, usually air, is forced through the gap between the fins. See Figure 1.

Figure 2 shows the elements of the enhanced design. The fins 5 are slotted 6 to provide a path for the air flow and stacked to form a solid laminate with the slots in register with each other so as to form a continuous air path. Joining of the stacked fins can be either brazed, riveted or welded. A combination of the riveted and welded design would be most effective and less costly.

The improved thermal efficiency is due to the fact that all the fins are in direct contact with the heat generating device 7, whereas in the conventional design, heat conducted to the spacers 4 must travel through the brazed interface in order to contribute thermally to the fins 3. The brazed interface has a higher thermal resistance than the fin.

The advantages of this design are:

. improved thermal efficiency

. fewer details to assemble

. slot size can be varied to meet thermal efficiency requirements . improved manufacturability

Disclosed anonymously.

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